Vulnerability identifier: #VU12089

Vulnerability risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-0240

CWE-ID: CWE-840

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco ASA 5500-X Series
Hardware solutions / Security hardware applicances

Vendor: Cisco Systems, Inc

Description
The vulnerability allows a remote unauthenticated attacker to cause DoS condition on the target system.

The weakness exists in the Application Layer Protocol Inspection feature due to logical errors during traffic inspection. A remote attacker can send a high volume of malicious traffic, trigger a deadlock condition and cause the service to crash.

Mitigation
Update to versions 201.2(1.1), 201.1(15.7), 101.3(1.2), 99.1(20.148), 99.1(0.4), 98.2(10.4), 98.2(0.11), 97.1(0.170), 96.2(0.163), 9.9(1.77), 9.9(1), 9.8(2.235), 9.8(2.12), 9.7(1.17), 9.6(4), 9.6(3.18), 201.2(11.1), 201.2(1.22), 201.1(15.19), 101.4(1.14), 99.2(0.25), 99.1(20.186), 98.2(0.16), 97.1(0.177), 96.4(0.15), 9.9(2), 9.9(1.99), 9.9(1.4), 9.8(2.235), 9.8(2.218), 9.8(2.21), 9.7(1.115), 9.7(1.22), 9.6(4.6), 9.6(3.240), 9.6(3.27), 201.2(15.2), 201.2(11.1), 201.2(1.34), 201.2(1.32), 201.1(15.24), 201.1(15.23), 101.4(1.31), 101.4(1.29), 99.2(0.47), 99.2(0.44), 99.1(20.193), 99.1(20.192), 98.2(0.18), 97.1(0.178), 96.4(0.16), 9.9(2), 9.9(1.99), 9.9(1.4), 9.8(2.236), 9.8(2.235), 9.8(2.218), 9.8(2.22), 9.7(1.115), 9.7(1.23), 9.6(4.6), 9.6(3.240) or 9.6(3.28).

Vulnerable software versions

Cisco ASA 5500-X Series: 9.6.4 - 101.4.1.24

---

External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa_inspect

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.